Greater London · England
External Mastic in Benhilton
We cover Benhilton for sealing brickwork movement joints, render, cladding and façade joints. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Plants rooting in failed movement joints
- Rain getting behind render or cladding at a joint
- Failed seals between different materials
Your questions about external mastic in Benhilton
Can you do external mastic in Benhilton?
Yes. Our work covers London and the South East, and Benhilton is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Is parking a problem for a job in Benhilton?
Parking in Benhilton, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can a movement joint be filled with mortar?
No. A mortar-filled joint can’t move, so the movement cracks the wall elsewhere. Use a flexible sealant with backing rod.
Where are you based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
What is backing rod for?
We fit closed-cell backing rod wherever the joint depth needs controlling. It sets the sealant depth and prevents three-sided bonding.
Do you do commercial work?
Yes. We can plan bigger jobs in stages to suit the site.
How much does external mastic cost in Benhilton?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or send us an email and tell us what needs doing and where.
External mastic in Benhilton
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. If you’re dealing with joints pointed up with cement by mistake and brick movement joints where the sealant has split, we can put it right, whatever the surface.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. In a converted house in Benhilton, it’s worth checking who is responsible for the outside before booking.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Location
- Benhilton (SM1, SM3, SM5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
We won’t take on work that won’t last, so these are the limits:
- Render that’s blown, hollow or coming away
- Walls that need new movement joints cut into them
- Structural movement, which needs a surveyor or engineer
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Façade panels
- Concrete & block
- Joints between brick and frames
Outside joints around Benhilton
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Nonsuch Mansion (about 1.9 miles south-west) nearby, there’s older building stock in the area around Benhilton as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Rented homes near Sutton Common station change hands often, and split movement joints are easy to miss on a rental until damp shows inside. Managing a site like All Saints Benhilton CofE Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Benhilton is about 4 miles south of Wimbledon, in Greater London. If you need external mastic in Benhilton, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We cover Greater London from our Crawley base, Benhilton included. Our Greater London coverage runs to 764 places, and Benhilton is one of them. There’s also a page for London, about 10 miles away.
We work across SM1, SM3 and SM5 for external mastic. Streets in the area include Vale Road, Crown Road and Lewis Road. We also cover the places around Benhilton: Sutton (1 mile south), St Helier (1 mile north-east), Rosehill (1 mile north-east), Carshalton (1 mile east) and The Wrythe (1 mile east). Further out, we also cover London (10 miles north-east), City of Westminster (10 miles north), Marylebone (10 miles north), Kensington (9 miles north), St Pancras (11 miles north) and Shoreditch (12 miles north-east).
Landmarks near Benhilton
In Benhilton, that means homes and buildings near Greenshaw High School, Manor Park and The Cricketers Inn and the streets around them. Benhilton has its own railway station: Sutton Common station. Other landmarks nearby include Honeywood Museum (1.4 miles south-east) and Chessington Castle Hill (4.4 miles west). Open spaces near Benhilton include Sutton Ecology Centre Grounds and Duppas Hill.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Keep soil, plants and ivy away from the joints
- Walk round the building once a year and look at the joints
- Never let anyone fill a movement joint with mortar
- Avoid pressure-washing directly into sealant joints
Don’t let soil, plants or ivy build up against the new joints. Anything that holds water against the joint wears it out sooner.
A joint that has stopped moving pushes the movement elsewhere, often as cracks near the joint. Resealing it early helps prevent that.
Towns and villages near Benhilton
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Why deal with it now?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. A stiffer product can damage the joint edge as it fails. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Benhilton, the repair is bigger than the sealant job would have been.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why us?
- 180+ five-star Google reviews
- Anti-fungal sanitary silicone in wet areas
- An ARBOMaster approved applicator
- A choice of colours where the product allows
See how sealant jobs are priced and our reviews.
What happens on the day
Before we leave, we go over the finished joints with you. The visit itself normally takes a few hours for a handful of joints, longer for a whole elevation, depending on the amount of work. In Benhilton, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
How to prepare
- Keep pets and children clear of the area while we work
- On commercial sites, let us know about site rules
- Tell us about any water getting in
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or send us an email and describe the job, and photos are welcome.
Advice
DIY versus a professional finish
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
When to call us in Benhilton
Some movement joints have been pointed up with mortar, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
People generally contact us after spotting one of these:
- Water getting into walls through failed joints
- Weeds or debris growing in open joints
- Panel joints letting water in
- Weathered mastic that no longer stretches
As a London address, Benhilton can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- What the quote includes, VAT included or not
- Whether they seal over old material or remove it
- Which colour the sealant will be
- What insurance they hold
How we quote for external mastic
Every job gets its own quote. This is what makes a difference:
- Mould in or behind the old joints
- When we can work, for business premises
- The old material and how stubborn it is
- Whether the work is at height
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Helping us quote
Before you ask for a quote, have a think about:
- Pictures of the joints, sent by email
- Any access issues, like height or stairs
- The problem you’ve noticed
- The type of property
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or email us.